Zinco a line or coarse screen half-tone block etched on zinc for letterpress printing. see zinc engraving.

线条锌版活版印刷用的线条或粗网半色调凸版。参阅锌电版。

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Zinco a line or coarse screen half-tone block etched on zinc for letterpress printing. see zinc engraving.

线条锌版活版印刷用的线条或粗网半色调凸版。参阅锌电版。

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